//===============================================================================
// Microsoft patterns & practices
// CompositeUI Application Block
//===============================================================================
// Copyright ?Microsoft Corporation.  All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===============================================================================

using System;
using Microsoft.Practices.CompositeUI.Utility;

namespace Microsoft.Practices.CompositeUI
{
    /// <summary>
    /// Indicates that a class extends <see cref="WorkItem"/> classes. The class
    /// must implement <see cref="IWorkItemExtension"/>.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
    public class WorkItemExtensionAttribute : Attribute
    {
        private Type workItemType;

        /// <summary>
        /// Initializes the attribute with the type of the work item to extend.
        /// </summary>
        public WorkItemExtensionAttribute(Type workItemType)
        {
            Guard.ArgumentNotNull(workItemType, "workItemType");

            this.workItemType = workItemType;
        }

        /// <summary>
        /// The type of the <see cref="WorkItem"/> to extend.
        /// </summary>
        public Type WorkItemType
        {
            get { return workItemType; }
        }
    }
}
